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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

PHP Manual
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DOMDocument->getElementById()

(no version information, might be only in CVS)

DOMDocument->getElementById() -- Searches for an element with a certain id

Description

class DOMDocument {

DOMElement getElementById ( string elementId )

}

This function is similar to DOMDocument->getElementsByTagName() but searches for an element with a given id.

For this function to work, you will need either to set some ID attributes with DOMElement->setIdAttribute() or a DTD which defines an attribute to be of type ID. In the later case, you will need to validate your document with DOMDocument->validate() or DOMDocument->validateOnParse before using this function.

Parameters

elementId: The unique id value for an element.

Return Values

Returns the DOMElement or NULL if the element is not found.

Examples

Example 1. DOMDocument->getElementById() Example


<?php

$doc = new DomDocument;

// We need to validate our document before refering to the id
$doc->validateOnParse = true;
$doc->Load('book.xml');

echo "The element whose id is books is: " . $doc->getElementById('books')->tagName . "\n";

?>

The above example will output:

The element whose id is books is: chapter

See Also

DOMDocument->getElementsByTagName()

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DOMDocument->createTextNode()	Up	DOMDocument->getElementsByTagName()

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Another Useful functions:

function.dom-domxpath-registernamespace | function.dom-domxpath-query | function.dom-domxpath-evaluate | function.dom-domxpath-construct | function.dom-domtext-splittext | function.dom-domtext-iswhitespaceinelementcontent | function.dom-domtext-construct | function.dom-domprocessinginstruction-construct | function.dom-domnodelist-item | function.dom-domnode-replacechild | function.dom-domnode-removechild | function.dom-domnode-normalize | function.dom-domnode-lookupprefix | function.dom-domnode-lookupnamespaceuri | function.dom-domnode-issupported | function.dom-domnode-issamenode | function.dom-domnode-isdefaultnamespace | function.dom-domnode-insertbefore | function.dom-domnode-haschildnodes | function.dom-domnode-hasattributes | function.dom-domnode-clonenode | function.dom-domnode-appendchild | function.dom-domnamednodemap-item | function.dom-domnamednodemap-getnameditemns | function.dom-domnamednodemap-getnameditem | function.dom-domimplementation-hasfeature | function.dom-domimplementation-createdocumenttype | function.dom-domimplementation-createdocument | function.dom-domimplementation-construct | function.dom-domentityreference-construct | function.dom-domelement-setidattributens | function.dom-domelement-setidattributenode | function.dom-domelement-setidattribute | function.dom-domelement-setattributens | function.dom-domelement-setattributenodens | function.dom-domelement-setattributenode | function.dom-domelement-setattribute | function.dom-domelement-removeattributens | function.dom-domelement-removeattributenode | function.dom-domelement-removeattribute | function.dom-domelement-hasattributens | function.dom-domelement-hasattribute | function.dom-domelement-getelementsbytagnamens | function.dom-domelement-getelementsbytagname | function.dom-domelement-getattributens | function.dom-domelement-getattributenodens | function.dom-domelement-getattributenode | function.dom-domelement-getattribute | function.dom-domelement-construct | function.dom-domdocumentfragment-appendxml | function.dom-domdocument-xinclude | function.dom-domdocument-validate | function.dom-domdocument-schemavalidatesource | function.dom-domdocument-schemavalidate | function.dom-domdocument-savexml | function.dom-domdocument-savehtmlfile | function.dom-domdocument-savehtml | function.dom-domdocument-save | function.dom-domdocument-relaxngvalidatesource | function.dom-domdocument-relaxngvalidate | function.dom-domdocument-registernodeclass | function.dom-domdocument-normalizedocument | function.dom-domdocument-loadxml | function.dom-domdocument-loadhtmlfile | function.dom-domdocument-loadhtml | function.dom-domdocument-load | function.dom-domdocument-importnode | function.dom-domdocument-getelementsbytagnamens | function.dom-domdocument-getelementsbytagname | function.dom-domdocument-getelementbyid | function.dom-domdocument-createtextnode | function.dom-domdocument-createprocessinginstruction | function.dom-domdocument-createentityreference | function.dom-domdocument-createelementns | function.dom-domdocument-createelement | function.dom-domdocument-createdocumentfragment | function.dom-domdocument-createcomment | function.dom-domdocument-createcdatasection | function.dom-domdocument-createattributens | function.dom-domdocument-createattribute | function.dom-domdocument-construct | function.dom-domcomment-construct | function.dom-domcharacterdata-substringdata | function.dom-domcharacterdata-replacedata | function.dom-domcharacterdata-insertdata | function.dom-domcharacterdata-deletedata | function.dom-domcharacterdata-appenddata | function.dom-domattr-isid | function.dom-domattr-construct |

PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.